/*
 Copyright 2007 Ole Rogeberg

 Licensed under the Apache License, Version 2.0 (the "License");
 you may not use this file except in compliance with the License.
 You may obtain a copy of the License at

 http://www.apache.org/licenses/LICENSE-2.0

 Unless required by applicable law or agreed to in writing, software
 distributed under the License is distributed on an "AS IS" BASIS,
 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 See the License for the specific language governing permissions and
 limitations under the License.
 */
package org.lifeyears.web.interceptor;

import java.util.Map;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.opensymphony.xwork2.ActionInvocation;
import com.opensymphony.xwork2.interceptor.Interceptor;

/**
 * Interceptor that checks if a user is logged in. If the user hasn't logged in, he is redirected to
 * the login page.
 *
 * @author Aleksander Blomskøld
 */
public class LoginInterceptor
    implements Interceptor
{
    protected final Logger log = LoggerFactory.getLogger( this.getClass() );

    @Override
    public void destroy()
    {
    }

    @Override
    public void init()
    {
    }

    @Override
    public String intercept( final ActionInvocation invocation )
        throws Exception
    {
        final Map session = invocation.getInvocationContext().getSession();

        final Long userId = (Long) session.get( "userId" );

        if ( userId == null )
        {
            log.info( "User not logged in - redirecting to login-page" );
            return "login";
        }

        log.debug( "User {} logged in. Invoking actionInvocation ", userId );
        return invocation.invoke();
    }

}
